WARNING: This is dangerous. Do not try this.
Only a madman or an idiot would actually do this.

Any responsible adult who actually tries this must accept liability for any deaths, injuries, and/or property damage it causes. If you are not a responsible adult (in the legal sense), don't even think about it. Bare skin exposed to dry ice can instantly develop frostbite or 'freezer burn'. A small quantity of dry ice stored in a sealed container can cause a large explosion. The noise caused by a dry ice explosion can damage the hearing of anyone nearby. Shrapnel and flying debris can cause serious injury or death. It is illegal to do this in many jurisdictions. This article is presented merely for entertainment.

This is an old trick.

• Take a used plastic soda bottle.
• Put a fist full of dry ice in the bottom.
• Pour a cup of hot water into the bottle.
• A plume of carbon dioxide will come out of the neck of the bottle.
• Tightly screw the top onto the bottle and toss it at least 20 yards from anyone.
• Sometime between the next 15 seconds and the next 2 hours the bottle will explode violently and make a very loud noise.

The hot water causes the dry ice to turn into carbon dioxide gas. Gas pressure in the bottle increases as more and more gas is formed until the plastic meets its bursting pressure. Dry ice from industrial suppliers is almost 100% carbon dioxide and will give you a short fuse delay. Dry ice from catering or supplier can contain a a high percentage of water ice which can stretch the delay to a couple of hours in cold weather. Increasing the amount of dry ice used can shorten the delay a little bit but you get diminishing returns- twice as much ice will not cut the delay in half.

One interesting variation is the dry ice depth charge. Tie a rope around the neck of the bottle and attach it to a cinder block. Prepare the bottle as usual, and toss it into a body of water (like a pond) after tightening the cap. You will be able to feel the ground shake from the shock wave as the bottle bursts.